﻿using System;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.InteropServices;
using System.ComponentModel.Design;
using Microsoft.Win32;
using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Shell.Interop;
using Microsoft.VisualStudio.OLE.Interop;
using Microsoft.VisualStudio.Shell;
using Expect.VisualStudio.Extensions;

namespace Expect.Vs2010.Extensions
{
    using Microsoft.VisualStudio.Editor;
    using Microsoft.VisualStudio.Text.Editor;
    using Microsoft.VisualStudio.TextManager.Interop;

    /// <summary>
    /// This is the class that implements the package exposed by this assembly.
    ///
    /// The minimum requirement for a class to be considered a valid package for Visual Studio
    /// is to implement the IVsPackage interface and register itself with the shell.
    /// This package uses the helper classes defined inside the Managed Package Framework (MPF)
    /// to do it: it derives from the Package class that provides the implementation of the 
    /// IVsPackage interface and uses the registration attributes defined in the framework to 
    /// register itself and its components with the shell.
    /// </summary>
    // This attribute tells the PkgDef creation utility (CreatePkgDef.exe) that this class is
    // a package.
    [DefaultRegistryRoot("Software\\Microsoft\\VisualStudio\\10.0")]
    [PackageRegistration(UseManagedResourcesOnly = true)]
    // This attribute is used to register the informations needed to show the this package
    // in the Help/About dialog of Visual Studio.
    [InstalledProductRegistration("#110", "#112", "1.0", IconResourceID = 400)]
    // This attribute is needed to let the shell know that this package exposes some menus.
    [ProvideMenuResource("Menus.ctmenu", 1)]
    [ProvideAutoLoad(UIContextGuids80.SolutionExists)]
    [ProvideService(typeof(SExpectVSService))]
    [Guid(Guids.guidExpect_ExtensionsPkgString)]
    public sealed class ExpectPackage : Package, IExpectPackage
    {
        private CommandSet _commandSet;

        private SelectionEvents _mySelectionEvents;

        private uint selectionEventsCookie;

        /// <summary>
        /// Default constructor of the package.
        /// Inside this method you can place any initialization code that does not require 
        /// any Visual Studio service because at this point the package object is created but 
        /// not sited yet inside Visual Studio environment. The place to do all the other 
        /// initialization is the Initialize method.
        /// </summary>
        public ExpectPackage()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering constructor for: {0}", this.ToString()));
        }

        /////////////////////////////////////////////////////////////////////////////
        // Overriden Package Implementation
        #region Package Members

        /// <summary>
        /// Initialization of the package; this method is called right after the package is sited, so this is the place
        /// where you can put all the initilaization code that rely on services provided by VisualStudio.
        /// </summary>
        protected override void Initialize()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering Initialize() of: {0}", this.ToString()));
            base.Initialize();
            try
            {
                (this as IServiceContainer).AddService(typeof(SExpectVSService), new ServiceCreatorCallback(CreateExpectVSService), true);

                IVsMonitorSelection selectionService = (IVsMonitorSelection)this.GetService(typeof(SVsShellMonitorSelection));
                _mySelectionEvents = new SelectionEvents(selectionService, this);
                selectionService.AdviseSelectionEvents(_mySelectionEvents, out selectionEventsCookie);

                _commandSet = new CommandSet(this);
                _commandSet.InitializeCommands((OleMenuCommandService)GetService(typeof(IMenuCommandService)));
            }
            catch (Exception ex)
            {
                WriteToActivityLog(__ACTIVITYLOG_ENTRYTYPE.ALE_ERROR, "Expect package throw an error\r\n" + ex.ToString());
                throw;
            }
            
        }
        #endregion

        public object GetVSService(Type t)
        {
            return this.GetService(t);
        }

        private void WriteToActivityLog(__ACTIVITYLOG_ENTRYTYPE type, string msg)
        {
            IVsActivityLog log = GetService(typeof(SVsActivityLog)) as IVsActivityLog;
            if (log == null) return;

            int hr = log.LogEntry((UInt32)type, this.ToString(), msg);
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            IVsMonitorSelection selectionService = (IVsMonitorSelection)this.GetService(typeof(SVsShellMonitorSelection));

            if (selectionService != null)
            {
                selectionService.UnadviseSelectionEvents(selectionEventsCookie);
            }
        }

        private object CreateExpectVSService(IServiceContainer container, Type serviceType)
        {
            if (container != this)
            {
                return null;
            }

            if (typeof(SExpectVSService) == serviceType)
            {
                return new ExpectVsService(this);
            }

            return null;
        }
    }
}
